Efficacy of prestressed SMA diagonal loops in seismic retrofitting of non-seismically detailed RC beam-column joints

Suhail, Raj; Amato, Giuseppina; Broderick, Brian; Grimes, Michael; McCrum, Daniel

doi:10.1016/j.engstruct.2021.112937

Cited by 9 publications

(8 citation statements)

References 52 publications

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“…Alternatively, EC8 (BSI EN 1998-1: 2005 provides an empirical equation that restricts the maximum permissible shear force at the mid-height of the joint panel. A detailed discussion on the predicted shear capacity of the non-seismically detailed BCJs tested in this study is given in a separate study by the authors (Suhail et al 2021a). Here, for brevity, only a summary of the results is presented in Table 3.…”

Section: Predicted Shear Capacity and Failure Load Of As-built Specimensmentioning

confidence: 99%

“…Realizing the severity of the problem, researchers in the past few decades have developed several retrofitting techniques for BCJs, most common of them include joint enlargement by providing either haunches (Pampanin et al 2006;Shafaei et al 2016;Shafaei and Nezami 2019) or shape modification of the joint core (Chaimahawan and Pimanmas 2008;Pimanmas and Chaimahawan 2010;Tsonos 2010) by casting in-situ concrete or jacketing: either using fibre reinforced polymer (FRP) wraps (Ghobarah et al 1996;Seible et al 1997;Mosallam 2000;Antonopoulos and Triantafillou 2003;Corte et al 2005), steel plates (Chai et al 1991;Priestley et al 1994;Fardis 2009), ultra-high performance hybrid fibre reinforced concrete (UHP-HFRC) (Sharma and Bansal 2019), ferrocement (Li et al 2013) or textile-based reinforced mortars (Al-Salloum et al 2011). Most recently, a technique of providing prestressed diagonal reinforcement in the joint core panel alone (Suhail et al 2015(Suhail et al , 2021aYurdakul et al 2018) has also been investigated. All these techniques are aimed at either preventing the brittle shear failure of the joint core or delaying it to improve the overall ductility of the system.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Retrofitting of Nonseismically Detailed Exterior Reinforced Concrete Beam-Column Joint by Active Confinement Using Shape Memory Alloy Wires

et al. 2023

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It is widely accepted that the seismic retrofitting of non-seismically detailed reinforced concrete beam-column joints (BCJs) in RC frame buildings is an urgent necessity due to its high vulnerability and potential consequences in seismic events. As a result, considerable effort has already been put into developing efficient and practical retrofitting solutions for such BCJs. Most of the existing techniques are however based on either passive confinement technique for example fibre reinforced polymer (FRP) wrapping or involve a considerable joint enlargement which, in many cases, is undesirable. In this study a new technique of retrofitting BCJs is proposed by employing a more effective method of confinement i.e., active confinement, utilising the shape recovery feature of shape memory alloys (SMAs).To evaluate the performance of the proposed retrofitting scheme, experimental tests were conducted on full-scale BCJ specimens. The efficacy of the proposed retrofitting scheme is evaluated in terms of enhancement in strength, ductility, energy dissipation capacity, damage reduction in the specimens, and ease of application. The results from this study suggest that the proposed retrofitting scheme could be effectively used in achieving the full capacity of the joints corresponding to beam yielding and consequently enhances the energy dissipation capacity of the system significantly.The test results demonstrated that the proposed retrofitting scheme performs excellently in reducing the joint shear strain (core damage) (to almost zero or negligible) and also in retaining the full axial load carrying capacity of the column even at very large drift values. The proposed retrofitted scheme could also be conveniently used in cases where the capacity ratio of column-to-beam needs to be improved.

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Section: Predicted Shear Capacity and Failure Load Of As-built Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic Retrofitting of Nonseismically Detailed Exterior Reinforced Concrete Beam-Column Joint by Active Confinement Using Shape Memory Alloy Wires

et al. 2023

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“…In the first category, SMAs are applied for the flexure strengthening [8] and shear strengthening [9] of RC beams; active confinement of RC cylinders [10] (solution could also apply to RC columns); strengthening of beam-column joints in RC frames [11]; combined flexure and shear strengthening of RC railway crossties [12]. The basic mechanism in the above studies is similar: applying SMAs to a stiff structure and generating prestress in the direction of concrete tensile stress or in the direction of concrete expansion, which can delay the cracking load in the concrete member.…”

Section: Overview Of the Researchmentioning

confidence: 99%

Shape memory alloys for structural engineering: An editorial overview of research and future potentials

Ghafoori

Wang

Andrawes

2022

Engineering Structures

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“…SMAs are applied in different fields such as biomedical, aerospace, and civil structures [ 15 ]. In civil structures, different shapes of SMAs are used for the retrofitting and strengthening of structures, such as application in seismic isolators [ 16 , 17 , 18 , 19 ], steel beam–column connections [ 20 , 21 , 22 ], bracing systems [ 23 , 24 , 25 , 26 , 27 ], different types of dampers [ 28 , 29 , 30 , 31 ], reinforced concrete beams [ 32 , 33 , 34 ], reinforced concrete columns [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ], reinforced concrete slabs [ 42 ], reinforced concrete beam–column connections [ 43 , 44 , 45 , 46 ], and wood structures [ 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Behavior and Energy Dissipation in Fiber-Reinforced Polymers through Shape Memory Alloy Integration: A Numerical Study on SMA-FRP Composites under Cyclic Tensile Loading

Eilbeigi,

Tavakkolizadeh,

Masoodi

2023

Materials

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Conventional fiber-reinforced polymers (FRPs) have a relatively linear stress–strain behavior up to the failure point. Therefore, they show brittle behavior until the failure point. Shape memory alloys, in addition to having high ductility and good energy dissipation capability, are highly resistant to corrosion and show good performance against fatigue. Therefore, using the SMA fibers in the production of FRPs can be a suitable solution to solve the problem of the brittle behavior of conventional FRPs. SMA fibers can be integrated with a polymeric matrix with or without conventional fibers and create a new material called SMA-FRP. This study investigates the effect of using different volume fractions of conventional fibers (carbon, glass, and aramid) and SMA fibers (NiTi) in the super-elastic phase and the effect of the initial strain of SMA fibers on the behavior of SMA-FRP composites under cyclic tensile loading. Specimens are designed to reach a target elastic modulus and are modeled using OpenSees (v. 3.5.0) finite element software. Analyzing the results shows that in the SMA-FRP composites that are designed to reach a target elastic modulus, with an increase in the volume fraction of SMA fibers, the maximum stress, residual strain, and strain hardening ratio are reduced, and the ability to energy dissipation capability and residual stress increases. It was also observed that increasing the percentage of the initial strain of SMA fibers increases the maximum stress and energy dissipation capability and reduces the residual strain and yield stress. In the investigation of the effect of the type of conventional fibers used in the construction of composites, it was found that the use of fibers that have a larger failure strain increases the maximum stress and energy dissipation capability of the composite and reduces the strain hardening ratio. In addition, increasing the elastic modulus of conventional fibers increases the residual strain and residual stress of the composites.

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Efficacy of prestressed SMA diagonal loops in seismic retrofitting of non-seismically detailed RC beam-column joints

Cited by 9 publications

References 52 publications

Seismic Retrofitting of Nonseismically Detailed Exterior Reinforced Concrete Beam-Column Joint by Active Confinement Using Shape Memory Alloy Wires

Seismic Retrofitting of Nonseismically Detailed Exterior Reinforced Concrete Beam-Column Joint by Active Confinement Using Shape Memory Alloy Wires

Shape memory alloys for structural engineering: An editorial overview of research and future potentials

Enhancing Mechanical Behavior and Energy Dissipation in Fiber-Reinforced Polymers through Shape Memory Alloy Integration: A Numerical Study on SMA-FRP Composites under Cyclic Tensile Loading

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